SUNWAYFOTO 42mm Screw Knob Clamp Arca Comp DDC-42i 1/4" Sunway SUNWAYFOTO brand Arca-Swiss compatible Versatile Jaw accepts QR's from RRS Wimberley, Jobu Design, Arca Swiss, Kirk Enterprises, Markins, etc. All metal construction 3/8" mounting hole with 1/4" adapter Includes bubble level, and the accessories pictured